This function moves the fdt_strerror() function, currently found in
the test code into the fdt library proper. This makes life easier for
any library users who want to provide meaningful error messages. The
function goes into a module of its own, so that users who don't need
the function won't get a copy of it linked in.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
First, this patch removes several underused error codes:
FDT_ERR_BADPOINTER and FDT_ERR_BADHEADER were not used at all and are
simply removed. FDT_ERR_SIZE_MISMATCH was very similar in spirit to
FDT_ERR_NOSPACE, and used only in circumstances where there can be no
confusion between the two, so is removed and folded into
FDT_ERR_NOSPACE. FDT_ERR_INTERAL was used on only one place, on a
"can't happen" check. It seems of little value so the check and error
code are removed also.
Second, the error codes have been re-numbered and grouped roughly by
severity. That is codes which can reasonably occur in normal
operation separated from those which indicate bad parameters (and
therefore a bug in the caller) or a bad or corrupted device tree blob.
Third the test function fdt_strerror() is cleaned up a little based on
these changes.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
At present, libfdt functions returning a structure offset return a
zero-or-positive offset on success, and return a negative error code
on failure. Functions which only return an error code return a
positive version of the error code, or 0 on success.
This patch improves consistency by always returning negative error
codes on failure, for both types of function. With this change, we do
away with the special fdt_offset_error() macro for checking whether a
returned offset value is an error and extracting the encoded error
value within. Instead an explicit (ret_value < 0) is now the
preferred way of checking return values for both offset-returning and
error-code-returning functions.
The fdt_strerror() function in the test code is updated
correspondingly to make more sense with the new conventions.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This patch abolishes the non-standard and confusing encoding of errors
into pointer return values. The only functions still returning such a
potentially encoded pointer are fdt_get_property() and fdt_getprop().
Those functions also return a length via an (int *). With this patch
those functions instead now return NULL on any error, and return the
code indicating the type of error in the length paramater.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
At present, the blob containing a device tree is passed to the various
fdt_*() functions as a (struct fdt_header *) i.e. a pointer to the
header structure at the beginning of the blob.
This patch changes all the functions so that they instead take a (void
*) pointing to the blob. Under some circumstances can avoid the need
for the caller to cast a blob pointer into a (struct fdt_header *)
before passing it to the fdt_*() functions.
Using a (void *) also reduce the temptation for users of the library
to directly dereference toe (struct fdt_header *) to access header
fields. Instead they must use the fdt_get_header() or
fdt_set_header() macros, or the fdt_magic(), fdt_totalsize()
etc. wrappers around them which are safer, since they will always
handle endian conversion.
With this change, the whole-tree moving, or manipulating functions:
fdt_move(), fdt_open_into() and fdt_pack() no longer need to return a
pointer to the "new" tree. The given (void *) buffer pointer they
take can instead be used directly by the caller as the new tree.
Those functions are thus changed to instead return an error code
(which in turn reduces the number of functions using the ugly encoding
of error values into pointers).
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Several places in fdt_rw.c incorrectly use fdt_offset_ptr(), using it
as if it returned an encoded error code on errors, instead of
returning NULL on error as it actually does.
In fact, however, in these instances the extra checks in
fdt_offset_ptr() are useless anyway, so we introduce a new (internal
use) _fdt_offset_ptr() and use that without checking.
(cherry picked from 3dffb1808dea6aee6158c92e17faa6ced9b183f2 commit)
The libfdt functions are supposed to behave tolerably well when practical,
even if given a corrupted device tree as input. A silly mistake in
fdt_get_property() means we're bounds checking against the size of a pointer
instead of the size of a property header, meaning we can get bogus
behaviour in a corrupted device tree where the structure block ends in
what's supposed to be the middle of a property.
This patch corrects the problem (fdt_get_property() will now return
BADSTRUCTURE in this case), and also adds a testcase to catch the bug.
fdt_property_offset() is the only function in the library returning a
direct offset to a property, and no function takes such an offset
(they only take offsets to nodes, not properties). Furthermore the
only client uses for this function I can think of involve immediately
translating the offset into a pointer, effectively duplicating the
internal function _fdt_getprop()
This function abolishes fdt_property_offset(), replacing it with
fdt_get_property(), a renamed and now externally visible version of
_fdt_getprop().
The error encoding for pointers is incorrect on machines where
sizeof(int) != sizeof(void *), which includes most 64-bit platforms
(in particular, AMD64 and powerpc64). This patch fixes it.
This patch fixes a number of embarrasing oversights which meant libfdt
did not work correctly on little endian machines. With this patch the
testsuite now passes on x86. Device trees are always created
big-endian.
v17 of the blob format adds a field for the size of the structure
block, but is backwards compatible with v16. This patch introduces
definitions for the new field, and uses it to improve the bounds
checking in the read-only code. It also cleans up the sequential
write code using it: we no longer need to borrow the version field as
a write pointer.
This patch pulls out the logic for finding a string in the string table
into _fdt_find_string(), from fdt_sw.c's find_add_string(). This function
will be useful for random-access read-write functions. In the process
clean up the search logic a little.
This patch adds exported accessor macros for the various flat device
tree header fields to libfdt.h. This necessitates moving some of the
byte-swapping functions.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This patch fixes some completely bogus error checking logic from the
nop_property testcase (resulted from a cut-and-paste error).
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
The range sanity checking on the fdt_string_cmp() function causes problems
for the sequential write code (or at least for using RO functions on an
incomplete SW tree). Plus they didn't really fit with the philosphy for
the RO code of working as widely as possible on weirdly constructed trees.
Without this rather odd constrained pattern rule, make attempts to build
dumptrees using the default %: %.c rule instead of the defined %: %.o and
%.o: %.c rules.
The reserve mem regions are screwy if you read a blob on x86. I'm
guessing there may be a few more of these lurking in the code.
Signed-off-by: Michael Neuling <mikey@neuling.org>
dtc always sets the physical boot CPU to 0xfeedbeef. Add a -b option to
set this. Also add warnings when using the wrong property with the
wrong blob version.
Signed-off-by: Michael Neuling <mikey@neuling.org>
even for ASM output. It was inconsistent with the binary
output form, and kernel folks decided to have the early
kernel perform the reservation itself.
it shouldn't be (because the assembler will do the necessary swapping).
The cell values (asm_emit_cell()) are different from the data values
(asm_emit_data()) because the cell values are generated within the
program and don't get swapped like the data values read from the dts file.
They should be left as they are so that the assembler will swap them,
if necessary. For example, when the property length field was 4,
the asm output contained ".long 0x4000000" and sent the kernel prom.c
dt parsing code into the weeds.
Pointed out by Mark Greer.
Add device-type and compatible as required fields for mdio node; add eTSEC
to ethernet model options.
Signed-off-by: Becky Bruce <Becky.bruce@freescale.com>
David Gibson